It would depend on what kinds of calculations, and the type of document. And it's also difficult to say if a sentence is needed for a hypothetical piece of text. (I assume we're talking about executive summaries in general and not about a specific one.)
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Neil Fein♦Sep 21 '12 at 5:06

1 Answer
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I agree with your teammate: Leave it out. Keep the executive summary as short and succinct as possible. It is understood that the rest of the report contains the details. You could make it clear where to find the calculations by using descriptive titles in the table of contents: